Half to ii



(No Model.)

R. C. NUGENT. GBNTERING DEVICE. No. 460,888. Patented Oct. 6, 1891.

llllllll IN VENOH WITNESSES IlivrTnn STATES PATENT OFFICE.

RICHARD O. NUGENT, OF IIARRISBURG, PENNSYLVANIA, ASSIGNOR OF ONE- I'IALF TO II. C. JENKINS, OF SAME PLACE.

CENTERING DEVICE.

SECIFICATION forming part of Letters Patent No. 460,888, dated October 6, 1891.

Application led November 18, 1890. Serial No. 3'7l,855. (No model.)

To all whom, t may concern: every directionsimultaneously. For the pur- Be it known that I, RICHARD O. NUGENT, pose of moving the lower ends of the levers of Harrisburg, in the county of Dauphin and inward simultaneously the bearings for co- State of Pennsylvania, have invented certain operation with the arms B are at the center 55 5 new and useful Improvements in Centering of the levers, and the upper end of the levers Devices; and I do hereby declare the followare connected by links D with the collar E, ing to be a full, clear, and exact description journaled loosely on the nut F,'vvorking on of the same, reference being had to the acthe central screw-threaded stem A. For concompanying drawings, forming a part of this venience in manufacture and operation of 6o IO specification, and to the letters of reference the device the nut F is provided with upmarked thereon. wardly-projecting thumb-pieces f and the This invention relates to iu'lprovenients in central annular bearing in which the collar devices for indicating and, if desirable, drill- E works. The collar E is formed in halves ing the central points of shafts, bars, tbc., such for the sake of convenience in application, 65 I5 devices being' particularly designed for use to said halves being heldv together by screws e indicate the centers for lathe-work, dsc. or otherwise, and is further provided with The object of the invention is to provide a lugs e', corresponding to the bifurcated ends device of simple design and easily operated, of the arms B, to form bearings for the inner which will clamp and center work of any ends of the links, as will be readily under- 7o 2o shape in cross-section; and the invention constood,

sists in certain novel details of construction The lower ends of the clamping-levers D and combinations and arrangements of parts are provided with pivoted shoes d, adapted to to be hereinafter described, and pointed out engage and conform to the inclination-of the particularly in the claims at the end of this surface of the work being operated upon as 75 25 specification. the lower ends of the levers are forced in- In the accompanyingr drawings, Figure l is ward by the upward movement of the nut F, a vertical sectional view through a centering which latter is turned in the proper direction device constructed in accordance with my inupon the screw-threaded stem by means of vention. Fig. 2 is a top plan view of the same. the upwardly -projecting thumb pieces f. 8O 3o Fig. 3 is a top plan view of the frame to which XVorking through the central stem and frame the clamping-levers are pivoted. Fig. 4 is a is the drill or punch carrier or stock H, havcorresponding view of the collar to which the ing the punch or drill I at the bottom, which, inner lends of the lever-operating links are it will be observed, is held at a point exactly connected. Fig. 5 is a perspective View of equidistant from all the arms, whereby any 85 35 the bottom of the frame, showing the lever, work grasped by the arms must necessarily the top of the frame and parts of the arms have its centerbeneath the point of the punch being broken away. or drill. When the work is so grasped, the

Similar letters of reference in the several punch or drill-carrier I-I is depressed and roigures indicate the same parts. tated by means of a crank-handle K and the 9o 4o The central portion of what may be termed center marked or drilled. Extending from the frame of the device consists of a tubuthe central stemV or frame and preferably lar screw-threaded shank portion A, provided slightly above and between two of the arms with a shoulder ct at the bottom, and a series B is an arm Il, to the end of which is pivoted of radial arms B, having their outer ends bia lever M, having its inner end bifurcated 95 45 furcated and formed in to bearings for the and provided with inwardly-projecting lugs reception of the clamping and centering arms m, adapted to enter an annular groove in the C. The arms B are four in number and have lower end of the punch or drill stock, as their outer ends bifurcated and formed into shown in Fig. 5, to force the spindle forward suitable bearings for the centering and clampduring the drilling operation. IOO

5o ing levers, said arms being regularly disposed In operation the work is first placed bein order that the work may be grasped from tween the lower ends of the levers, which are without danger of disturbing the position of the work,and, further, by pivoting the levers Y directly on the frame the Work is not forced away from the punch or drill pointas the levers are set up.

Having thus described my invention, what I claim as new isl. ln a centering device, the combination,

with the frame having the tubular screwthreaded stein and the radially-disposed arms at the bottom of the saine, of the centering and clamping levers pivoted on the ends of the arms, the nut working on the central screw-threaded stem below the upper ends of the levers, the collar surrounding the nut, and

the links connecting said collar and the upi per ends of the levers, substantially as described.

In a centering device, the combination, with the frame having the tubular screwy threaded stein and the regularly-disposed radial arms at the lower ends, the punch oi' drill stock working through said stem,.and the lever for moving the spindle holding said stock elevated, ofthe centering and clanipinglevers pivotally mounted on the ends of said arnis, pivoted shoes on the lower ends ot' said arms, the nut working on the central stem below the upper ends of the levers, the collar surrounding the nut, and the links connecting the said collar and the upper ends of the levers, substantially as described.

3. In a centering device, the combination, with the traine having the tubular screwthreaded stern, the regularly-disposed radial arms at the lower end, and the single arm proj ecting between said regularly-disposed arms, the punch or drill stock working through .said stem and having the annular groove therein, and the lever pivoted on said intermediate l arm and co-operating with the groove on the lower end of the punch-stock, of the centering and clamping levers pivotally mounted on the ends of said arms, the pivoted shoes on the lower ends ot' said levers, the nut Working on the central stein below the upper ends of the levers, the collar surrounding the nut, and the links connecting the said collar and upper ends of the levers, substantially as described,

RICHARD C. NUGENT.

Vitnesses:

MAURY D. JENKINS, ALFRED L. HARBOLT. 

